import numpy as np

from sklearn import datasets,linear_model

from sklearn.model_selection import train_test_split

def load_data():

    diabetes = datasets.load_diabetes()

    return train_test_split(diabetes.data,diabetes.target,test_size=0.25,random_state=0)

#线性回归模型

def test_LinearRegression(*data):

    X_train,X_test,y_train,y_test=data

    regr = linear_model.LinearRegression()

    regr.fit(X_train,y_train)

    print('Coefficients:%s, intercept %.2f' % (regr.coef_, regr.intercept_))

    print("Residual sum of squares: %.2f"% np.mean((regr.predict(X_test) - y_test) ** 2))

    print('Score: %.2f' % regr.score(X_test, y_test))

# 产生用于回归问题的数据集

X_train,X_test,y_train,y_test=load_data()

# 调用 test_LinearRegression

test_LinearRegression(X_train,X_test,y_train,y_test)